Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').

9 results found.

  1. Konus-Wind observation of GRB 180828A
  2. GRB 180828A: AstroSat CZTI detection
  3. GRB 180828A: Swift/UVOT Upper Limits
  4. GRB 180828A: RATIR Optical and NIR Observations
  5. GRB 180828A: Swift-BAT refined analysis
  6. GRB 180828A: Swift-XRT refined Analysis
  7. GRB 180828A / Swift J1754.9-2548: Enhanced Swift-XRT position
  8. GRB 180828A: Fermi GBM observation
  9. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548


Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit